US6286188B1 - Regulated drawing frame - Google Patents

Regulated drawing frame Download PDF

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US6286188B1
US6286188B1 US09/486,732 US48673200A US6286188B1 US 6286188 B1 US6286188 B1 US 6286188B1 US 48673200 A US48673200 A US 48673200A US 6286188 B1 US6286188 B1 US 6286188B1
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Prior art keywords
sliver
drafting system
fiber
drafting
rotational speed
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English (en)
Inventor
Christian Müller
Jürg Faas
Beat Näf
Christian Grieshammer
Theodore Götz Gresser
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Priority claimed from DE1997138053 external-priority patent/DE19738053A1/de
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D01G15/12—Details
    • D01G15/46—Doffing or like arrangements for removing fibres from carding elements; Web-dividing apparatus; Condensers
    • D01G15/64—Drafting or twisting apparatus associated with doffing arrangements or with web-dividing apparatus
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G23/00—Feeding fibres to machines; Conveying fibres between machines
    • D01G23/06—Arrangements in which a machine or apparatus is regulated in response to changes in the volume or weight of fibres fed, e.g. piano motions
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G31/00—Warning or safety devices, e.g. automatic fault detectors, stop motions
    • D01G31/006—On-line measurement and recording of process and product parameters

Definitions

  • the present invention relates to a drafting system with a drive arrangement with a regulating device for regulating mass variations in a fibre mass supplied from a supply source to a drafting system in which arrangement the mass variations are detected by at least one measuring device coordinated to the drafting system and transmitted to a control unit.
  • a conventional card operates at a constant (pre-settable) production rate, i.e. the fibre sliver is delivered at a predetermined speed from the delivery arrangement
  • the function of a regulating drafting system implies that the draft is variable (controllable). Provision of a large sliver storage device between the card delivery system must be variable. This, however, creates problems concerning the drive for the sliver deposition or coiler system, the inertia of which is relatively considerable, arranged downstream from the drafting system.
  • sliver storage device is arranged between the card and a regulating drafting system. This can be seen in particular in the FIGS. 3 and 4 of the DE-OS reference. Adjoining the regulating drafting system a sliver storage device is arranged driven by a separate motor. The measured values determined by the pair of measuring rolls upstream from the regulating drafting system are compared to the preset desired values. The resulting deviation signal serves for controlling the drive motor for the intake pair of rolls of the drafting system in order to adapt the draft ration, and to level out thin and thick places respectively.
  • this signal transmitted to the control device for the drive of the fibre sliver source, or of the card respectively, in such a manner that this drive also can be adapted correspondingly.
  • the reaction of the card however, is subject to substantially higher inertia than the drafting system.
  • the resulting differences in the material delivery, and in the material intake respectively, are leveled out in the sliver storage device adjoining the card.
  • the storage device in this arrangement is provided with sensors for scanning the contents of the storage device.
  • the drives of the fibre sliver source (card) and of the fibre sliver take-up device (coiler) are changed accordingly in such a manner that the contents of the fibre sliver storage device is maintained substantially constant.
  • This adaptation of the two drives results in additional differences, especially as the elements of the card (e.g. the card main drum) are subject to different inertia influences other that the elements of the sliver depositing device (coiler).
  • a co-ordination of cards is known in which a storage device is coordinated to each card downstream and in which the card slivers delivered by the individual storage devices after passing through a drafting system are delivered to a common sliver deposition device or coiler.
  • the delivery speed of the drafting system is reduced until the missing card sliver has been re-inserted.
  • a scanning sensor is coordinated to each individual card sliver. Owing to the reduction in delivery speed, corresponding to the loss of one card sliver, the fibre sliver reserve for the draw frame is exhausted more slowly than in the normal operating mode at higher intake speeds.
  • an increase of the card delivery speed also is proposed if the fibre sliver storage device arranged downstream is depleted in excess of a predetermined value in such a manner that the operation of the subsequent draw frame is not jeopardized.
  • the arrangement shown is suitable for levelling out massive short term variation (loss of sliver). Levelling out long term deviations however, is not envisaged using this arrangement, or is solved unsatisfactorily only.
  • the thickness of the fibre sliver delivered by the card be measured and compared to a pre-set desired value.
  • the signal thus determined is used in controlling the material supply device (feed roll) arranged upstream from the card. Owing to this arrangement, long period deviations in the mass of the card sliver delivered can be reacted on. Avoiding and eliminating of short wave deviations e.g. using a regulated drafting system is not envisaged in the arrangement described.
  • the action in the control of the drive of the feed roll for compensating for long period mass deviations becomes effective, however, only after a major time delay.
  • the solutions proposed thus far generally provide the drafting system for levelling out short term variations in the fibre sliver.
  • At least one further means is coordinated to the drafting system which is suitable to detect a regulating action on the drive of the drafting system required for maintaining a predetermined desired rotational speed before or during the regulating action and to apply it for influencing the base rotational speed of the drafting system.
  • the capacity of a storage device possibly required between the textile processing machine and the regulated drafting system arranged subsequently can be kept relatively small as the regulating actions are compensated for by adapting the base rotational speed of the drafting system. Furthermore, a security device is created which ensures that the drive rotational speed (base rotational speed) does not drift from a base setting.
  • the further means preferably is suitable to detect differences between the delivery speed of the supply source and the intake speed of the drafting system.
  • the difference in speed results from the change in the rotational speed of the regulated roll of the drafting system.
  • the further means also can be suited for detecting long term mass variations relative to a pre-set desired value.
  • the further means is a fibre sliver storage device which can be equipped with corresponding sensor elements.
  • the differences in the transporting speed of the fibre sliver can be detected, which are caused by the variable and regulated take-off speed of the intake pair of rolls of the drafting system un it on the basis of the variable filing degree in the storage device, and the base rotational speed of the drafting system can be acted upon.
  • a pre-control is effected which ensures that the degree of filling of the storage device can be kept to a low level.
  • the fibre sliver storage device can be laid out as a sliver sag storage device in which arrangement the sagging of the fibre sliver loop can be continuous or discontinuous.
  • the textile processing unit in this arrangement can be a card, in which arrangement the sensor provided at the delivery device of the card at the same time can be applied in a long term regulation of the feed device of the card.
  • the further means also can consist of a sensor device for scanning the rotational speed of the regulated pair of rolls of the drafting system and of at least one pair of transporting rolls for the fibre mass rotating at constant speed, in which arrangement the ratio of rotational speeds serves for determining the long term mass deviation, based on which corresponding action upon the base rotational speed of the drafting system can be effected.
  • the supply source consists of at least two coordinated cards arranged parallel in which arrangement the drive of the second card via the control device is adapted to the drive of the first card, and that the fibre material delivered by the respective cards is detected by a sensor each and that the averaged signal generated by the two sensors is applied for acting upon the base rotational speed of the drafting system.
  • the fibre sliver storage can be equipped with a scanning device.
  • the scanning device for the fibre sliver storage device of the second card can be applied for overriding the control link of the two card drives.
  • the drive of the take-off roll of the second card is regulated until the fibre sliver loop in the fibre sliver storage device is brought back to within the sagging tolerance limits.
  • This overriding action can be limited in time, i.e. in case of a longer duration of a deviation detected it is assumed a defect has occurred and the machines are brought to a standstill for inspection.
  • sag sensors can be applied which scan the sagging of the fibre slivers in the fibre sliver storage device continually or discontinuously.
  • the draft ratio chosen is higher than 2, and preferably ranges between 3 and 6. This should additionally ensure that a fibre sliver of high quality structure is formed which beneficially influences in particular the subsequent processing steps.
  • the fibre sliver forming device preferentially should generate a fibre sliver of low finness (or high linear density respectively), e.g. of at least 8 ktex and preferably 10 ktex or even more (e.g. 12 ktex).
  • a relatively large working width of the card preferentially is chosen, e.g. exceeding 120 mm. This can be realized using a machine according to EP patent application No. 866 153. The whole contents of said EP application thus is incorporated and considered as an integral part of the present description.
  • the linear density of the sliver after drafting system can be e.g. 3 to 5 ktex.
  • the delivery speed at the delivery of the drafting system can e.g. exceed 400 m/min.
  • a drafting system of such type is provided arranged on the sliver depositing or coiler device (compare the volume “Verkütician Baumwollspinnerei (Abreviated Cotton Spinning)” p. 72 and the CS-Patent 98 939 mentioned therein) in such a manner that the fibre sliver delivered by the drafting system is deposited as soon as possible (without being transported over a long path).
  • FIG. 1 a schematic view of an inventive arrangement
  • FIG. 2 a further embodiment according to FIG. 1;
  • FIG. 3 an additional further embodiment according to FIG. 1;
  • FIG. 4 a schematic top view of an arrangement with two cards according to the present invention, and in the
  • FIG. 5 a schematic diagrammatic view of the mass of a card sliver produced plotted in combination of the diagram of the adapted rotational speed of the drafting system.
  • a card 1 is shown schematically which is supplied with fibre material via a feed chute 3 and via a feed roll 2 arranged adjacent to it.
  • the fibre material is taken over by the main drum 4 and is processed in cooperation with carding elements not shown.
  • the carded material is taken off the main drum 4 by a take-off roll 5 and is transferred to a take-off device 10 indicated schematically. From this take-off device 10 the fibre sliver 6 is transferred in the transporting direction F to a sag storage device 14 equipped with a pair of take-in rolls 15 and with a pair of delivery rolls 16 .
  • the degree of sliver sagging (fibre sliver loop FS) is scanned by a column-type sensor 20 provided with a series of sensors arranged along a column. Using this arrangement any position of the fibre sliver loop can be detected precisely.
  • the sensor signals are transmitted via the circuit 21 to a control unit S.
  • the fibre sliver 6 delivered by the storage device 14 passes through a measuring device 70 which is laid out in the form of a pair of feeler rolls.
  • the value measured by the measuring device 70 is transmitted via the circuit 71 to the control unit S.
  • the fibre sliver is transferred to the drafting unit 30 formed by the pairs of rolls 24 and 25 between which it is drafted.
  • the base drive of the drafting unit 30 is effected by the Motor M 2 which is controlled via the circuit 40 by the control unit S.
  • the motor M 1 of the take-off roll 5 in this arrangement is laid out as the leading or master motor to which the motor M 2 is coordinated in its base rotational speed as a slave motor in such manner that predetermined drive conditions are maintained.
  • This base rotational speed of the motor M 2 can be overridden by the signals of the sensor 20 which is to be explained in more detail in the following.
  • the motor M 2 drives a gear arrangement 32 from which a branch drive 35 extends to the delivery rolls 25 and a further branch drive 36 extends to a regulating gear arrangement (differential gear). From this regulating gear arrangement 33 the intake pair of rolls 24 is driven via the drive train 37 .
  • the regulating actions required for levelling out mass variations (shorn and long term) according to the evaluation of the signals transmitted by the measuring device 70 in comparison with a pre-set desired value are effected by a regulating motor M 3 which via a circuit 38 is controlled by the control unit S and which acts upon the regulating gear arrangement 33 . Owing to this action the draft between the pairs of rolls 24 and 25 is changed and mass variations in the fibre sliver thus are leveled out.
  • the drive of the pair of measuring rolls 70 is effected via the drive train 68 which branches off from the drive path 37 . In this manner, movement of the intake pair of rolls and the pair of measuring rolls 70 is synchronized.
  • Changes in the rotational speed of the intake pair of rolls 24 are acting backward, against the transporting direction F, and are taken up in the storage device 14 where the loop position FS is changed. Scanning the position of the sagging loop in this arrangement can be effected in steps in such a manner that if a certain amount of change is detected, overriding of the base rotational speed of the drive motor M 2 is induced by the control unit S. Owing to this reduction, or increase respectively, in the base rotational speed, the effect of the change in rotational speed caused by the regulating action, particularly in levelling out long term mass variations, are compensated for.
  • the size of the storage device thus can be kept to a minimum.
  • the drive of the sliver deposition device or coiler 60 arranged subsequently is permanently coupled to the drive of the drafting system unit 30 , namely via the drive train 42 which branches off from the gear arrangement 32 and is connected to a gear arrangement 50 .
  • the calender rolls 47 , the coiler gear 48 and the can turntable 49 are driven by the gear arrangement via the gear train 51 which is shown schematically.
  • a further scanning sensor 44 is arranged which via the circuit 45 is connected with the control unit S. This arrangement serves for the final control of the linear density of the fibre sliver the machine being stopped if the linear density exceeds a predetermined tolerance field over a predetermined period of time.
  • the fibre sliver passes via the calender rolls 47 and via the coiler gear 48 is deposited in coils into a sliver can K which is rotated by the can turntable while the sliver is being deposited.
  • FIG. 2 an arrangement is shown in which adjoining the take-off device 10 a pair of measuring rolls 55 is arranged which via the circuit 56 is connected with the control unit S.
  • This measuring device 55 scans essentially the long term mass variations (drifting of the fibre sliver linear density).
  • the signal given off by this measuring device 55 is compared to a preset desired value in the control unit S and a corresponding controlling signal is generated which is used for overriding the base rotational speed of the motor M 2 . Owing to this arrangement a subsequent regulating action in the drafting system 30 can be reacted on early for maintaining a constant level of the position of the fibre sliver loop in the storage device.
  • the storage device 14 in this arrangement is provided with two sensors S 1 and S 2 which are merely triggered only if the position of the fibre sliver loop FS exceeds predetermined tolerance limits. Such occurrences are caused by a disturbance, and the machine (plant) is switched off.
  • the signal given off by the measuring device 55 additionally is used for regulating the drive motor MS of the feed roll of the card 1 for levelling out a drift in linear density already at the card.
  • the motor MS is influenced by the control unit S via the circuit 53 .
  • FIG. 3 a further embodiment is shown in which a pair of take-off rolls 11 is arranged adjoining the take-off device 10 .
  • the rotational speed f this pair of rolls is monitored by a sensor 12 .
  • a sensor 62 monitoring the rotational speed is coordinated to the pair of take-in rolls 24 of the drafting system 30 and is connected with the control unit S via the circuit 63 .
  • the lay-out of the storage device 14 corresponds to the one described already for the embodiment according to the FIG. 2 .
  • the ratio of the rotational speed of said pairs of rolls ( 11 , 24 ) remains constant. If drifting of the fibre sliver mass in one direction or in the other is detected by the measuring device 70 , a regulating action is effected in such a manner that the rotational speed of the intake rolls 24 is adapted.
  • the ratio of the rotational speeds of the pairs of rolls 11 and 24 changes owing to which a control signal is generated by the control unit S as a function of the change which changes, or overrides respectively, the base rotational speed of the drafting system 30 , and of the motor M 2 respectively, in such a manner that, as described for the arrangement with reference to FIG. 2, the regulating action is compensated for.
  • the compensation for the regulating action effected by overriding the base rotational speed of the drafting system 30 , essentially concerns the long term mass variations only and not the short term ones which are not very important and, considered over time, level themselves out.
  • FIG. 4 an embodiment is shown in which two cards 1 a , 1 b are operating in parallel side by side. These cards also are equipped with feed rolls 6 a , 6 b and licker-in 3 a , 3 b , main drums 2 a , 2 b and take-off rolls 4 a , 4 b .
  • the drive of the take-off rolls 4 a and 4 b is indicated schematically with 75 , and 46 respectively, which are connected with the control unit S via a control L 8 , and L 9 respectively.
  • the drive 20 a , and 20 b respectively, of the feed rolls 6 a , 6 b are connected with the control unit S via the control circuits L 7 ′, and L 7 ′′ respectively.
  • the drive 46 of the take-off roll 4 b operates as a slave of the drive 75 of the take-off roll 4 a which operates as the master drive.
  • sensors O 1 , U 1 and O 2 , U 2 are arranged for scanning the filling level, or the amount of sagging of the fibre sliver loops. In this arrangement the sensors O 1 , O 2 scan an upper position and the sensors U 1 , U 2 a lower position of the fibre sliver loop.
  • the tolerance band extends within which the position of the fibre sliver loop can move freely without triggering a regulating action.
  • Arrangement of a sensor for continuous scanning also could be envisaged.
  • the sensors O 1 , U 1 and O 2 , U 2 are connected with the control unit S via the circuits L 10 , and L 11 respectively.
  • the two fibre slivers Fa and Fb are joined into one single fibre sliver FZ.
  • This FZ subsequently is guided past a sensor 17 which scans the mass variations in the fibre sliver FZ.
  • the fibre sliver FZ scanned by the sensor 17 subsequently is transferred into the regulating drafting system 83 .
  • the values measured by the sensor 17 are transmitted to the control unit S via a circuit (not shown).
  • the drafting system 83 in the example shown consists of three pairs of rolls 84 , 85 and 86 arranged in series, in which arrangement the intake pair of rolls 84 is driven at a variable rotational speed for levelling out mass variations in the fibre sliver.
  • the pair of delivery rolls 86 is driven by a main motor 65 and a gear train 26 arranged subsequently at a constant rotational speed.
  • the intermediate pair of rolls 85 is driven at a constant rotational speed, the ratio of which to the rotational speed of the delivery rolls 86 arranged subsequently is constant. According to the pre-set ratio of rotational speeds, a constant draft is effected between the pair of rolls 85 and 86 .
  • the motor is controlled via an inverter 84 and via the circuit L 6 connecting the control unit S and the motor 65 .
  • a differential gear 28 is driven via a drive train 92 and drives the pair of intake rolls 84 via the drive train 31 .
  • the drive of the differential gear 28 can be overridden by a regulating motor 29 which is controlled via an inverter (not shown) and via the circuit L 5 from the control unit S. This overriding is effected based on the signals transmitted from the sensor 17 which are compared to a desired value pre-set in the control unit S.
  • a sliver depositing device or coiler Downstream from the regulating drafting system 83 a sliver depositing device or coiler is arranged using which the fibre sliver F 1 delivered by the drafting system, after passing through a pair of calender rolls 34 and a coiler gear T, is deposited in a sliver can K
  • the can K in this arrangement is placed on a driven can turntable (not shown) which rotates the can during the filling process.
  • the can turntable, the calender rolls 34 and the coiler gear are driven via the drive train 98 by a gear arrangement 96 .
  • the gear 96 in turn is driven via the permanent drive connection of the gear arrangement 26 , shown schematically, which is driven by the main motor 65 .
  • the pair of delivery rolls 86 is permanently coupled with the drive elements of the sliver depositing device or coiler KA directly via the gear arrangement 26 .
  • a mixed signal MS is generated from the signals obtained from the sensors 10 a and 10 b in the control unit S which is compared to a pre-set desired value.
  • the control signal SS resulting from this comparison is applied for influencing the pre-set base rotational speed of the motor 65 .
  • the base rotational speed of the drafting system is coordinated, or adapted respectively, to the rotational speed of the take off roll 4 a . Only after the nominal operating speed is attained, the process of overriding the base rotational speed becomes operable.
  • the fibre slivers Fa and Fb supplied by the cards 1 a and 1 b are scanned by the sensors 10 a and 10 b and the corresponding measured values (mass) are transmitted to the control unit S where a mixed signal MS is generated.
  • This mixed signal is compared to a preset desired value from which comparison a control signal results if the value measured deviates from the pre-set value.
  • This control signal is transmitted to an inverter 94 which via the circuit L 6 adapts the rotational speed of the motor 65 and thus also adapts the base rotational speed of the drafting system unit as well as of the sliver depositing or coiler device KA.
  • the long term mass deviations measured by the sensors 10 a and 10 b at the same time also are used for controlling the drive of the drive arrangements 20 a and 20 b of the feed rolls 6 a and 6 b of the cards 1 a , 1 b .
  • the drive arrangements here are connected to the control unit S via the circuits L 7 ′ and L 7 ′′.
  • the fibre slivers Fa and Fb are transferred into the storage devices 11 a and 11 b in which the slivers can sag and where they are scanned by the sensors O 1 , O 2 , and U 1 , U 2 respectively. If the respective fibre sliver loop is located between the upper and lower the sensor, no additional control impulse is generated. As soon as, e.g., the sensor U 2 indicates that the loop formed by the fibre sliver Fb is sagging too much, the direct co-ordination of the drive 46 of the take-off roll 4 b is overridden by the drive 75 , which acts as the master drive, and rotational speed of the roll 4 b is reduced.
  • control action is effected in the storage device 11 a in which arrangement, if the fibre sliver loop is located outside the tolerance band between the sensors U 1 and O 1 over too long a time period, the system is switched off as occurrence of a disturbance is to be assumed.
  • the fibre slivers leaving their respective storage devices are joined into a common fibre sliver FZ before entering a measuring device 17 arranged subsequently.
  • the mass variations are measured and the corresponding signal is transmitted via the circuit 3 to the control unit S. Based on a comparison of the measured value and the pre-set desired value, a corresponding signal is transmitted via the circuit L 5 to the regulating motor 29 which via the regulating gear arrangement 28 adapts the rotational speed of the intake rolls 84 for levelling out the mass variations.
  • the draft between the pairs of roll 84 and 85 is changed.
  • the draft between the pairs of roll 85 remains constant.
  • the fibre sliver F 1 drafted in the manner described is delivered by the drafting system unit and via the calender rolls 34 and the coiler gear T is coiled into a can K.
  • the total draft applied is chosen greater than 3, as the trailing fibre hooks generated in the take-off process of the fibres on the card are straightened out partially in the drafting process which beneficially influences the subsequent processing steps.
  • Such levelling than can be effected again as soon as the regulating action at the feed roll 6 a , 6 b exerts its influence at the card delivery. If these mass deviations occur alternatively upward, and downward respectively, the filling level of the sliver storage devices 11 a , 11 b is not influenced much.
  • the sliver storage devices 11 a , 11 b must offer sufficient capacity. If however, these mass deviations occur at regular intervals or at random intervals and essentially in one the same direction, the capacity of the buffer storage device 11 a , 11 b soon reaches its limits.
  • an action, as claimed according to the present invention, on the base rotational speed of the base motor 65 is effected.
  • the mass deviation detected by the sensors 10 a , 10 b exceeds a pre-set tolerance band
  • the rotational speed of the motor 65 is adapted after a time lag t. From the upper diagram it can be seen that the mass diminishes and correspondingly the draft in the drafting system 83 is to be reduced also which is effected by an increase of the rotational speed of the pair of intake rolls 84 . If now, as shown in the lower diagram according to the FIG.
  • the fibre sliver storage devices 11 a , 11 b are levelling out short term regulating actions whereas the long term deviations are leevelled out by changes in the base rotational speed of the motor 65 .
  • the sensors U 1 , O 1 , U 2 , O 2 in this arrangement serve as an additional auxiliary monitoring device.
  • a further aspect of the present invention concerns the improvement of the degree of fibre orientation, and the reduction in the number of hooked fibres (fibre hooks) in the card sliver.
  • card sliver in this context signifies a fibre sliver delivered to a sliver depositing or coiler device arranged downstream from the card.
  • the second aspect of the present invention provides a method of forming a card sliver, where a card web is condensed into a fibre sliver, the fibre sliver is drafted and the drafted sliver is deposited, characterized in that the fibre sliver in the drafting process is subject to a draft high enough to significantly increase the degree of the fibre orientation, and to lower the proportion of hooked fibres substantially.
  • This aspect of the present invention provides a corresponding apparatus with a drafting system to be arranged between the sliver forming device and the sliver depositing or coiler device of a card, characterized in that the drafting system can generate a draft high enough in such manner that the degree of fibre orientation is significantly increased, and the proportion of hooked fibres is substantially lowered.
  • fibre sliver drafting process e.g. by means of said drafting system
  • said drafting system e.g. by means of said drafting system
  • the proportion of trailing hooks significantly can be used for reducing the proportion of trailing hooks significantly (compare the volume “Verkütician Spinnerei” (Abreviated Spinning”), page 90).
  • the sliver forming device preferably should generate a fibre sliver of high linear density (great mass), e.g. of at least 9 ktex and preferentially of 10 ktex or even more (e.g. 12 ktex).
  • a fibre sliver of high linear density greater mass
  • cards of a relatively large working width preferentially are applied, of e.g. of more than 1200 mm. This can be achieved using a machine according to our EP-Patent Application No. 98'810'088.9.
  • the complete contents of said EP-Application thus is considered an integral part of the present description.
  • the EP-Application very probably will be published on Sep. 23, 1998 under the No. 86'153.
  • the linear density of the sliver after the drafting system can be e.g. 3 to 5 ktex.
  • the delivery speed of the drafting system can e.g. exceed 400 m/min.
  • a drafting system of such type is arranged on the sliver depositing or coiler device (Compare the volume “Verkütician Baumwollspinnerei (Abreviated Cotton Spinning”), page 72 and the patent CS-98'399 mentioned therein) in which arrangement the fibre sliver delivered by the drafting system can be deposited as soon as possible (without passing along an extended transporting path).
  • the second aspect of the present invention correspondingly provides a method according to which a card web is condensed into a fibre sliver and is drafted, a draft of at least 2 and preferentially of more than 3 being applied before the sliver is deposited.
  • the present invention under this aspect provides a card with a fibre sliver forming device, a sliver depositing or coiler device and with a drafting system for generating a draft higher than 2 and preferentially higher than 3.
  • the drafting system can be laid out as an evening aggregate, i.e. it can be laid out for generating a controlled variable draft which, however, is not of vital importance for the present invention. Changes in the draft ration will cause corresponding changes in the degree of fibre orientation.
  • the card itself thus advantageously can be laid out as an evening aggregate (e.g. according to EP-A-271'115) in which arrangement the adjoining drafting system is conceived for enhancing the degree of fibre orientation.
  • a regulating drafting system preferentially is laid out for a total draft GV (between the pair of intake rolls and the pair of delivery rolls) of more than 2 and preferably of 3 to 6.
  • a total draft GV between the pair of intake rolls and the pair of delivery rolls
  • the average draft in the regulated (variable) drafting zone can be e.g. about 2.5
  • the draft applied in the other (constant) drafting zone can be e.g. about 1.1 to 1.5
  • the “main draft” in the second, variable draft zone) can be about 2.0 to 4.
  • the linear density of the fibre sliver delivered from the drafting system preferentially is in the range of 3 to 5 ktex.
  • the drafting system is arranged preferentially directly above the coiler gear of a sliver depositing or coiler device, e.g. as shown in DE-Gbm-296 22 293.
  • the fibre sliver deposited into the can can be supplied directly, e.g. according to EP-A-627 509, to the open end spinning machine.
  • the second aspect of the present invention preferentially (but not necessarily) is applied in combination with the other characteristics, described in the introduction, of the present invention.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Preliminary Treatment Of Fibers (AREA)
US09/486,732 1997-09-01 1998-08-31 Regulated drawing frame Expired - Fee Related US6286188B1 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE1997138053 DE19738053A1 (de) 1997-09-01 1997-09-01 Karde mit Bandspeicher und Regulierstreckwerk
DE19738053 1997-09-01
CH2711/97 1997-11-24
CH271197 1997-11-24
CH156098 1998-07-23
CH1560/98 1998-07-23
PCT/IB1998/001357 WO1999011847A1 (fr) 1997-09-01 1998-08-31 Banc d'etirage regule

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US20060010653A1 (en) * 2004-04-21 2006-01-19 Trutzschler Gmbh & Co. Kg Apparatus for consolidating a conveyable fibre web, for example of cotton, synthetic fibres or the like
CN100387764C (zh) * 2002-07-06 2008-05-14 吕特·英格尔纺织机械制造股份公司 条横截面测量装置、这种装置的构件以及纺纱机
US20150152575A1 (en) * 2013-12-02 2015-06-04 Rieter Ingolstadt Gmbh Textile Machine with Variable Tension Draft
US11286585B2 (en) * 2017-02-09 2022-03-29 Trützschler Group SE Method and apparatus for processing fibers

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FR2825380B1 (fr) * 2001-06-01 2003-08-15 Schlumberger Cie N Procede de controle de la qualite de fabrication de rubans de fibres textiles
CZ307263B6 (cs) * 2016-11-21 2018-05-02 Rieter Cz S.R.O. Zařízení pro sledování průvěsu přástu před navíjecím zařízením přípravárenského stroje pro výrobu přástu
DE102022116504A1 (de) * 2022-07-01 2024-01-04 Maschinenfabrik Rieter Ag Regulierstrecke, Verfahren zum Betreiben einer Regulierstrecke sowie Verfahren zum Umrüsten einer Regulierstrecke

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Cited By (17)

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Publication number Priority date Publication date Assignee Title
US6584651B2 (en) * 2000-05-11 2003-07-01 Trutzschler Gmbh Co. Kg Device for increasing the specific weight of fiber material in a carding machine
US6679043B2 (en) * 2000-11-08 2004-01-20 Maschinenfabrik Reiter Ag Spinning machine
US6578238B2 (en) * 2001-04-05 2003-06-17 TRüTZSCHLER GMBH & CO. KG Apparatus for depositing sliver in a flat coiler can and method
US20030150266A1 (en) * 2001-12-11 2003-08-14 Joachim Dammig Use of microwaves in the spinning industry
US7103440B2 (en) 2001-12-11 2006-09-05 Rieter Ingolstadt Spinnereimaschinenbau Ag Use of microwaves for sensors in the spinning industry
US6983516B2 (en) * 2002-04-04 2006-01-10 Rieter Ingolstadt Spinnereimaschinenbau Ag Spinning preparation machine
US20040194257A1 (en) * 2002-04-04 2004-10-07 Rieter Ingolstadt Spinnereimaschinenbau Ag. Spinning preparation machine
US20040060352A1 (en) * 2002-06-20 2004-04-01 Rieter Ingolstadt Spinnereimaschinenbau Ag. Method and device to evaluate signals of a sensor as well as textile machine
US6880207B2 (en) * 2002-06-20 2005-04-19 Rieter Ingolstadt Spinneremaschbau Ag Method and device to evaluate signals of a sensor to monitor a textile machine
CN100387764C (zh) * 2002-07-06 2008-05-14 吕特·英格尔纺织机械制造股份公司 条横截面测量装置、这种装置的构件以及纺纱机
WO2004074561A1 (fr) * 2003-02-22 2004-09-02 Rieter Ingolstadt Spinnereimaschinenbau Ag Machine textile
CN100500960C (zh) * 2003-02-22 2009-06-17 吕特英格纺织机械制造股份公司 纺织机
US20060010653A1 (en) * 2004-04-21 2006-01-19 Trutzschler Gmbh & Co. Kg Apparatus for consolidating a conveyable fibre web, for example of cotton, synthetic fibres or the like
US7451526B2 (en) * 2004-04-21 2008-11-18 Trutzschler Gmbh & Co. Kg Apparatus for consolidating a conveyable fibre web, for example of cotton, synthetic fibres or the like
US20150152575A1 (en) * 2013-12-02 2015-06-04 Rieter Ingolstadt Gmbh Textile Machine with Variable Tension Draft
US9873960B2 (en) * 2013-12-02 2018-01-23 Rieter Ingolstadt Gmbh Textile machine with variable tension draft
US11286585B2 (en) * 2017-02-09 2022-03-29 Trützschler Group SE Method and apparatus for processing fibers

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EP1009870B2 (fr) 2008-09-17
EP1009870B1 (fr) 2002-07-03
DE59804686D1 (de) 2002-08-08
EP1009870A1 (fr) 2000-06-21
WO1999011847A1 (fr) 1999-03-11
TR200000962T2 (tr) 2001-07-23

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